Amelia st



May 8, 1928.

F. L. YERGES BIAS BUFFER Filed Aug. 2'7, 1925 INVEN TDF\ AT KNEY Patented May 8, 1928.

unrrei stares? rnenirrn ynnens. or rnnivron'r; OHIO; AME IA n. senses, nxncurnrx or SAID FRANK L. Ynnens, nnonasnn, assrenon so ran ivranuraorunine oomrnnmor FREMONT, care, A CORPORATION or onico.

BIAS BUFFER.

Application filed August a, 1925. Serial no. saws.

This invention relates to bufiing and the sections or wheels of fabric for delivering abrasive and the manufacture of such sections. This invention has utility when incorporated in plies integral for greater than ply area and preferably bias cut and pleated or folded into approximate ply area, and the assembling of such plies into sections.

Referring to the drawings:

Fig. 1 is a view of a bias cut blank as cut from strip stock, as canvas duck;

Fig. 2 isa pleated stitch assembled ply as untrimmed and formed from the blank 15 of Fig. l;

Fig. 3 is a section of assembled plies, parts being broken away;

Fig. 4 is an edge view of a section, parts being broken away; and

Fig. 5 is a view showing a wheel made up of such sections and mounted for use.

Strip material 1 is shown as having opposite edges 2, 3, from which extend diverging cuts 4: to parallel cuts 5 thereby completing the long strip 6 as a blank with tapered ends 7. Blank strip 6 is folded on itself herein by pleating to approximately one-third its length, comprising pleats 8 perpendicular to the edges 5, which pleat-s are parallel to each other, and are assembled by stitching 9 parallel to each other and approximately at right angles to the folds or pleats 8. These folds 8 may in practice be formed by a pleating machine and the stitches 9 run by a multiple needle stitcher for producing such stitches simultaneously in parallel across the ply as folded to approximate ply area. These pleated and stitched plies 10 are placed, as to the folds 8, at a slightly angularly shifted position and assembled between outer plane plies 11 by stitching 12, 13. These stitches 12 are parallel and intersect the parallel stitch-es 13 at approximately right angles to result in a criss-cross structure. Such assembled sections are trimmed to circular form and central opening 14: provided for mounting on arbor 15 against collar 16 to be held in position by washer 17 set up by nut 18. Bearings 19 mount arbor 15 with driving pulley 20 to be actuated by belt 21.. The bearings 19 are mounted on jack-frame 22. l

' In building up a buffer section from a pleated ply, as herein, a pleated ply may be the equal of three single plies and a section may be built up say of seven pleated plies, and the outer plain or binding plies to have the equivalent in material of a twenty-three ply section. These sections are of approximately uniform character radially as to the quantity of fabric. The labor of production is not in excess of similarly stitch-as sembled flat ply sections of the same quantity of cloth. ,The bias cuttings for the blanks are efl'ected, as herein disclosed, with a reduction in the total waste and reduction in the cost of cutting which may be done three times as fast as the plain disk buff.

There is again in assembly, due to the fewer number of plies. The labor of the folding or pleating and the pleat laying stitches 9 about oifsets the handling of the greater number of plies and the grouping thereof. The resulting structure is one wherein the bias cutting of the sheet material 1 as to the warp 23 and woof 24, is such that at the'entire periphery of the folded or pleated ply there is fray-out resisting bias margin. The termini of the folds 8 are symmetrically grouped and provide additional composition or adhesive carrying pockets in peripheral series in addition to the pockets provided by the cries-cross stitching 12, 13.

The resulting section is bias as to the peripheral exposure ofv the plies with the folds or pleats so distributed and held by the stitchings, that there may be no catching of the materialbeing acted upon therein to be pulled from the hands of the operator. Such material whether of aluminum, brass, or other sheet or cast metal is quickly acted upon herein for an output or life of the wheel from two to three times that of the same material as assembled independently of the pleating or folding. Accordingly, there is efficiency and economy hereunder. The cuttingv saving runs from two to three percent. The operation increases economy at least one hundred percent over the plainply type of section. The folds are symmetrical and the stitchings are symmetrical for disk rotation in either direction. The bias is uniform forthe entire radial extent of the disk.

WVh-at is claimed and it is desired to secure by United States Letters Patent is:

1. A bufling Wheel ply made from a blank, the marginal edges of which blank are bias cut in respect tu the Weave, said blank being folded into parallel pleats so that the result- 1 ant form of ply is substantially circular.

2. A butting Wheel section made up of parallel pleated plies, each ply being placed at an angle with respect to its adjacent plies.

In Witness whereof I aiiiX my signature.

- FRANK L. YERGES. 

